linux-kernel - Re: [PATCH] btrfs: convert data_seqcount to seqcount_mutex

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Message-ID: <20201023165626.GK6756@twin.jikos.cz>
Date:   Fri, 23 Oct 2020 18:56:26 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     dsterba@...e.com, a.darwish@...utronix.de,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH] btrfs: convert data_seqcount to seqcount_mutex_t

On Wed, Oct 21, 2020 at 01:17:24PM -0700, Davidlohr Bueso wrote:
> By doing so we can associate the sequence counter to the chunk_mutex
> for lockdep purposes (compiled-out otherwise) and also avoid
> explicitly disabling preemption around the write region as it will now
> be done automatically by the seqcount machinery based on the lock type.

Thanks, the enhanced seqlock is new to me and makes sense regarding
lockdep. I've added a comment to mention the mutex association and added
it to misc-next.